I was in Peter Jones - Sloane Square (part of JLP), yesterday and noticed that they had this reduced to £37.45. There were 5 left. This is £96 at Amazon, and £99 at Play.com. Cheapest I can see is £66 at Tesco Direct. I can't see it Online, so looks like its Instore only.
Transformers 2: Revenge Of The Fallen: Supreme Combiners Devastator Action Figure (6 Individual Combining Figures) - John Lewis